MECHANISM OF ACTIVATION AND CATALYSIS OF CHEMILUMINESCENCE BY EU(FOD)3 CHELATE IN THERMAL-DECOMPOSITION OF ADAMANTYLIDENEADAMANTANE-1,2-DIOXETANE

Complexation of the chelate both with dioxetane and with adamantanone (2), the product of decomposition of dioxetane, have an important effect on chemiluminescence (CL) in thermal decomposition of adamantylidene-adamantane-1,2-dioxetane (1) in the presence of Eu(fod)3 chelate. The stability constants of Eu(fod)3.1 and Eu(fod)3.2 complexes were obtained. It was found that Eu(fod)3 catalyzes and activates chemiluminescent decomposition of 1. The rate constant (k2) of decomposition of the Eu(III).1 complex was determined from the kinetics of quenching of CL, and the activation parameters were determined from the temperature curve. Luminescence from the 5D1-level of the Eu(III) ion was detected in the CL spectrum and was correlated with direct (bypassing the triplet of the ligand) transfer of excitation energy from 2t* to the luminescent levels of Eu(III) in the geometrically distorted complex Eu(fod)3.2.